* {
  margin: 0;
  padding: 0;
}

body {
  font: 12px/1.6 CXChineseQuote, -apple-system, BlinkMacSystemFont, Helvetica Neue, Segoe UI, Arial, PingFang SC, Hiragino Sans GB, Microsoft YaHei, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

span {
  color: #A8A8B3;
}

.top-nav {
  width: 100%;
  height: 40px;
  background: #3A4357;
  box-shadow: 0 2px 17px 0 rgba(211, 211, 211, 0.5);
  text-align: center;
  line-height: 40px;
  font-size: 16px;
  color: #A8A8B3;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;
}

.top-nav a {
  float: right;
  width: 94px;
  height: 40px;
  background: #3A8BFF;
  border-left: 1px solid #313A4C;
  font-size: 14px;
  line-height: 40px;
  color: #FFFFFF;
  text-decoration: none;
}

.bodyImg {
  position: fixed;
  right: 0;
  bottom: 0;
  width: 432px;
  height: 432px;
}
.bodyImg img {
  display: block;
  width: 100%;
  height: 100%;
}

.center {
  width: 490px;
  padding: 60px;
  box-sizing: border-box;
  background: #fff;
  box-shadow: 0px 2px 10px rgba(237, 238, 240, 0.5);
  border-radius: 8px;
  margin: 180px auto 50px;
}

.prompt {
  font-size: 32px;
  text-align: center;
  margin-bottom: 30px;
  color: #3A8BFF;
}

.grade {
  font-size: 16px;
  line-height: 70px;
  margin-bottom: 8px;
  text-align: center;
  color: #8A8B99;
}
.grade b {
  font-size: 44px;
  display: inline-block;
  padding: 0 12px;
  font-weight: normal;
}

.gray {
  padding: 20px;
  background: #F7F8FA;
  border-radius: 4px;
  margin-bottom: 25px;
  color: #8A8B99;
  font-size: 14px;
}
.gray p {
  line-height: 20px;
  margin-bottom: 10px;
}

.p5 {
  margin-bottom: 30px;
  text-align: center;
  color: #8A8B99;
  font-size: 14px;
}

.p5 a{
  font-style: oblique;
  color: #3A8BFF;
}

.p5 span {
  margin: 0 auto;
  display: block;
  width: 150px;
  height: 30px;
  line-height: 30px;
  font-size: 14px;
  color: #F7704E;
  background: #FFEFED;
  border: 1px solid rgba(247, 112, 78, 0.1);
  border-radius: 15px;
  margin-bottom: 5px;
}